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Christopher Bache is complimentary of some aspects of Wilber's work, but calls Wilber's writing style glib and superior and suggests that Wilber tends to overlook the more complicated aspects of spiritual purification and past-life interpretation.

Jennifer Gidley noted the conceptual breadth of Wilber's integral evolutionary narrative in transcending both scientism and epistemological isolationism.

She also drew attention to some limitations of Wilber’s integral project, notably his undervaluing of Gebser's actual text, and the substantial omission of the pioneering contribution of Steiner, who wrote extensively about the evolution of consciousness, including the imminent emergence of a new stage.